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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b2c3edf0ea74c67ae5eb528a1c297f6cac9956ef45e8f7daf5678d311173810' 
  AND token = 'qdqTw/dHv3oHiN/oNVF50aBg8L2oejMbxhEAu9NV2us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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