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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a0566b2f2fd899b472584dbc99dd95fb405dec63854892319403036e0a8b93e' 
  AND token = '+UNPbv4Iy98npgvZCDy0ledSq4WNh6qOKReccxLaPms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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