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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a0483483d047c99db777c9a463f18a781d41e52ad6e2edb3fe776cfcaf9d377' 
  AND token = 'OUj3B6Dg0e9nx3kVcro6CsR1w+9LBRpaxwc7lu/s2Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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