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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da88983bf906450eb84a7c40e8c65460a82bbdab9d2d5ac1023a5a4a18ffda60' 
  AND token = 'Wk6yIjZvwVWWKrTAOi9ip5cCJp9TGBVI9a9Y6tii2Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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