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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b93004ee8354e8f6e45963be1d05190a5fa592ea2db838aefd39dafce5597a53' 
  AND token = 'PeMrDerGPkaYKcNoJ5Y+LdwR9EAvIeumlqnE+bjWf0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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