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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faf2d542176cabaf76f7b674ec97991b7d4ea64be95282cd2d24695bf6c66de6' 
  AND token = '2H3qtGgxwuIe5KTtSkzw2tKu7oWNnw7R2g5F091MY7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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