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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c8bd65decfaa54f7a19f7aa558b2783c69b6fe030e4a85bdb8f9a3d8d14e523' 
  AND token = 'xEcvDOhZGyst5Wuo7tGEb4ggvezckTRJ6O57Mmb90KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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