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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c9bab95a0e7157742bf2a4c55fbbfb6660a6a561377d70b5fbdb8c074153776' 
  AND token = 'YZI5fW+vDY5TBrFbar4e6SiO0+hFxxtj5k80ZbpIiB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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