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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d16a41a8dffc69427e4a81c74e5e9a5d02c2be908f35835d8e6a96988e56671' 
  AND token = 'Sxfz90+a9OZ3KYTzA4xDW9P3n1OkcuBXs8nUTNpPyqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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