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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fe21fd1c119fc42bd0a2e6261e1a2cf6a4b4eadc0855921dd63602c0e5707ea' 
  AND token = 'tWRCTpiJCuPDqRSKq9gY2RRF4unI/auiTM55yicplgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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