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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aab89e8f8f75aa4efb9876b3d4e641579640924a62aac12fc8e0965e81812665' 
  AND token = 'hM4uGUjMmne8MvgSAAhSqxoRXA7P2Esg59W7f79ZSQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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