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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6d3f1bbfbb1004e2703135a1c2bfcb2531588db94c45791462eaee0beb2a5ea' 
  AND token = '4CM9Aqu+emflYHE3ydcR6CtWKS68gEmYisThleAX8K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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