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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c566960dacb40dd7ede7282608eae0ede9cd51bff7f4a914f6cc2f6541a7513a' 
  AND token = '9LOHVgBH9wvtp4Jow9Z/pzd/QAB54GWbysO016rIF1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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