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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18abc5d61e2011a3a4a2a8f0f8d9c35177a600131f974aeba4959731eb395c12' 
  AND token = 'hJIsd2nMmJNsVHlhiIzI0r45AqUmDUHUH86pFGuBAo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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