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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0be35f6771c23fed3d87981f306d8acdd7a2b44928cb66d21c17c64bfa7c20b5' 
  AND token = '3TxeAWCXJ648OC4BkcxULlKNO0ugsWlnZrp11dA6U5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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