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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a389f3cbb0604ff17cd0e9b17f32d4f8830b9d548b308c7d9e2d8312bd0a9ad' 
  AND token = 'Ao/Ze2rkxDdCO9Dbe/uL4ZUFONm6njcLJZxBUkH2lJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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