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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c9ed0aada2642c92c3fef3a795d652c18453e049a7e0ef6f81f7b7db767d9c0' 
  AND token = 'KohT2mX9z0Lblqssz/3kbTkdIgxwt70xIe0DfV/3p7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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