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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1adfe55a3336303f18f53777506323434202c1498c3152ad0545ce912c66d67' 
  AND token = 'w0i7t6qlzM0qgEEczQF7WrDx7MuC8KbSbf2gfo579IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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