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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e485ead4b00aaf94b0a33c88fd3d1d6e97fd4db221fd53219c358fb60a122f9b' 
  AND token = 'wQ6CqVpv6iuGMxfUHiSWM23Qtsz7S3CPR6hvt6ewwls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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