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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e07ec9649ea74c2e1c40932ab6fdad9a68f1dd494d8e2273aa94e198173bdda6' 
  AND token = 'DJUH/a7Wz60NV6D1UbsEJ+GDDqXVn30nHRofIDDjZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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