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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7734c39eb84a3d962e85ead0c8f2f24c357aa055cd6d62806763b1e2a66815c0' 
  AND token = 'iP/1DbV7yMBPPPHt870bIv6Bntm4L14H3Y981zKkLcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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