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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8c39569f09e0193815007ef9013015b1de5a393feebd10705c4339094ffae11' 
  AND token = 'u6yTBmuXPZFUNV5Vn4DH91+gmpjbiMuSA/NMwjmEXr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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