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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b97c38c7bb2afd0d27128c00af9f6b2e2ae820bd863e9159d4d357bf44a6b70c' 
  AND token = 'pz6hkcB8en2EB38kAP5HePcU0iHZh55Gmu63so/Pzgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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