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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '446f9af74cc0c01cbc74f13466d370e009d709bbb77e3550839b32f9d47c83eb' 
  AND token = 'n9ppkMZQ+Gc4e2ML3Yc1riw9ea6obzS1j7a9+uTm/Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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