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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28eaba14b5a19c3204d70f2cd8d29db363733eea7a3716175d8a7d78c8caf28d' 
  AND token = 'XAkicc8GOR5wc707yopubVYYpzJdLoDPf6NGP4C3efE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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