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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0b73580813aac77db801b411f77bd749af9b00631b5a15c51736a10438294ad' 
  AND token = 'yFsTe8pQfFTY+OEd9Um7DFnUUWBexAJbWUswQUK/R5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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