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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b73ce6e811be7e137f8380d49307e60731513b7b4992e4441a0aa1a3aa137f63' 
  AND token = '7IpdDGZF3NII7+9SXqme+gdMLSJzjGkQ9FjHnKfN3Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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