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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94163139737f0e25d9eb450a0d9ca7a4578c35700c756ade2b4a35e823e72789' 
  AND token = '2v/6ELDLi6575EQhIHt9kCj9BEOd2cOqt2W/6kPnMzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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