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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6994416d3eb62109a5e6de0b004ff03cf85270f67d37e24bb08fe7fba4355d6' 
  AND token = 'PCnIY7dS9DcbYOuZ8dk7HuvSRoo/Y9dkmQt25d1E9tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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