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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4927228dca48efaf5e93472fa161b0cfb15efab376f0d8aa16aed56b8af3bdc4' 
  AND token = 'ac1saBbtWE3qfn5rIc/ysCYZPGmQTm6qGSoR21bMM3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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