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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ea379cb0632ee7a5a3525e483f07d82788ad3cf8f7a88ec6801ae1b3c74580b' 
  AND token = 'p50tdmOJbhL9wEIvJ44fg5KYd4hP3wgeKq9Qt48nlvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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