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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b78569d8da511b5f33fe5792360c0987c11d335c0611e866622d455101dd2c5' 
  AND token = '2auroXcDs9V7PVxUqNvs41OFy0L0WMyBlNFI+T89Zww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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