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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd5d1eeadeeb004d3da6ee5a13731c063ae98c5cdbc23b43afcb2ba312057b02' 
  AND token = 'rYB9yEYShdxBAQ3NJ0KIqs607Zr8EGhPzsPZmhUoUoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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