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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec6ee49c624e0b9eeac881b96fc2d434034fba0a93405d480e33c00d3dbad2cd' 
  AND token = '9ONUgwX2hLN2AbXt5DfMWXGd0oOaXNT4tcYJZapm4r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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