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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2f4645c17622f7be31e845c4588756b3bdecabd0bb48cc86f539e6bd64a8f2e' 
  AND token = '0L3IOWfBPF/Xg88jX3tEeCqOdTHm5F3aQEXLuExUvKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}