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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37a04d6e20e040f986951081fbccf31b4b4892b06d16aeb60323de46797bdea9' 
  AND token = 'jCkdJ8YoXgyDmTIx97g4aZ6Q8TH0tvXNj+YwOYxK1T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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