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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5d4f847df6381640d4fa9b79806e0c3953de8334006c37a0d7c4df87c6be973' 
  AND token = 'Yd3X1DpLcF900R3iIs4K+Eyw2OhZvpHrWe5D3UtgRMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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