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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ccea15e3363b056c845054ad1a557edfe1b35ab0057312f03fbef6e91db104a' 
  AND token = 'P4VaGjnNZQn3gJIT3pzyebfvKlER9QxFHbXk5FPh0sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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