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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48cac2c26d14e9dd28fcefb2512ce70282e2783988d1052e401425eecf1442a7' 
  AND token = '45imYkKTkCkiSRMSz2zKRlKq1W5Zb/JoENks80zXgYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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