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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f8d0ed459327d6974018e6eb49c2939bdc6d1f286f308eef12e4aa2705038df' 
  AND token = 'aL0B/nyU9YRPZu6sM3055DWcsL6eg3z3x5+rAfg4iYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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