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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01f361c11e7df64b08d157a2ec9d3bad2c73e5861a8492b8ecc50558ec4b7ac7' 
  AND token = 'qIDpqERt5+o7NQ/ZLUnnMXdz1p+d9naeDn9eavBa9pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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