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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bdcaccacb6053d0e0dd40e6e0fcfe4aa3fa2cb5deb4f4f5bd8364718e30aae2' 
  AND token = 'egeRcmVZQhoBMgpAT83AeWftCdy8F/bwH8tVFVhP2ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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