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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c2e595de75dfc6f112a993a66110a9bfcff9274be4572c3907693b835e4265' 
  AND token = 'Yw7O607RvZS0VK1ygiVsXyyI4W6zRDUH2VRz5izT5fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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