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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e472782e27339997cf0fcf1fb1de5d37283b0f7a4566a0f689c49d28c4cfeea' 
  AND token = 'uNN7xZL+Qma3ioZpOUja85/+BdLpc+rEpMwP8CrEegk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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