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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6be035fe2e07aae71024804ff39e4f4d0fd40af1c9d727a4bdb57cbf34be0ca0' 
  AND token = 'FLVLDgUtF6vnG71OXscKmy4gYQ2NVAeJg1q6q+d1MnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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