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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0f07ae84b52086713e6e0b80bc4b00f3080a58d7051e800ba4fd92fc7357ff7' 
  AND token = 'wChUfn3O2Rpix49Z6WVIsad0W5aHYqozgsXfMhGl58I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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