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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7b8c7e30950b21548ea2b53ec488e5578f437aa93cbbd3b266a99a64d08a137' 
  AND token = 'eyKdg99yuGPIJXp8pbgBPuPkQXFSFA50pe1jOEsEHDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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