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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7bd8a83b12ab5aca32e45fffcdcae74cdd635ce1115beed5989a0fd631369bc' 
  AND token = 'BFos3z6xiWRJUZfDIkTZw3uyOB58LB96Hdeb3m2H6X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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