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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '597ef464a9cc15ce4430ecc19977f331c5db27e9cd9724cfe2832af4ce2a1ecc' 
  AND token = 'Dyx4ij5WclaWoZWHziFGKWhrUrdHNepEkA0+nnCkVN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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