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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '877bd81e375e7f26b420cb1308e86cc555024413aa475407ddbfd53e4c968e7c' 
  AND token = '951VJJS4R+rRX6wIa7X90xiTGvAFN0I9Ex/1RnH4/9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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