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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '078490270257b9cc7da4db780c794a5e1414b52a4ea5d4955a61e2de95611c89' 
  AND token = '8scdfVvKBkJnDu8MdBfRw6m5fd8ZbETu90zWsigNDMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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