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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1f5f5fd73c3fc7665d8f85fe0bffdff4ef8410553efd1b3da8ace5f0c05faa5' 
  AND token = 'Yi7LL+cbOmLVN7OhfrfKDLFsF7qbwmd4BsbFQ+WY8Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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