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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d7887d87610ddd42d78ebb09f288a7f7044f4f605b6da24e7643ca9f93fdd1f' 
  AND token = 'fbHnEgVshiUfyNp0sjfDZ7JHXbf24ICyCTLJeDVuG/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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